Aviation of the Gambia

08/01/2023

Most of us have never had to worry about exceeding VNE - especially in level flight. And in a piston airplane, VNE is about as far away from stall speed as you can get.
But, the same isn't true in a jet. Especially a subsonic one. At a jet's operating ceiling, its Maximum Mach Number (MMO) is often extremely close to its stall speed. And that region of flight is called the "Coffin Corner"
The coffin corner's real name is the "Q Corner", because "Q" is the abbreviation for dynamic pressure. Coffin corner occurs from the interaction between stall speed and critical mach speed, which are both caused by pressure over your wing. So, "Q Corner" is the techie name, but coffin corner sounds more dramatic.
The region is deadly. Get too slow, and you'll stall the jet at high altitude (not something you want to do). Get too fast, and you'll exceed your critical mach number. The air over your wings will go supersonic, you'll pitch down, the aircraft will accelerate, and your wings will fall off. Also bad.So why does this happen at a jet's maximum ceiling? As you increase altitude, true stall speed increases, and the true airspeed to reach MMO decreases. Coffin corner is the region just below their intersection.

True Stall Speed: Increasing With Altitude

As you climb, the air becomes less dense, and your wings need more airflow to generate the same amount of lift. So, as you climb, your true stall speed increases. This is true in a prop, turboprop, or jet.

06/01/2023

Most of us have never had to worry about exceeding VNE - especially in level flight. And in a piston airplane, VNE is about as far away from stall speed as you can get.

29/12/2022

The heaven has me back.🛫

21/12/2022

The Boeing triple 7X /777Xfoldable wingtip ❤️🙏 awesome

21/12/2022

Ready for pushback ❤️🙏

21/12/2022

https://www.facebook.com/100064166677763/posts/527307196084832/?flite=scwspnss

20/12/2022

https://www.facebook.com/100064623521976/posts/526249432872503/?flite=scwspnss

22/11/2022

Here is why laser strikes are hazard to pilots

The FAA says that in 2021 it's received the highest number of unauthorized laser reports since 2016. Could you be next?

06/11/2022

Click on the link

It's frustrating to watch stripe after stripe pass underneath your nose, well past where you planned to touch down. Worse yet, your airspeed just isn't bleeding off.

21/08/2022

09/07/2022

How to fly the Windshear Escape Manoeuvre in the Boeing 737 Max ✈️

Windshear is a sudden change of wind direction and/or speed and is most dangerous at the lower levels, as a sudden loss of airspeed and altitude can occur.

At low level, it’s most commonly found in stormy weather and affects both take offs and landings.

All airliners have a Windshear detection system and is one of the many safety features that make airline flying so safe.

It works by taking data from the EGPWS and weather radar systems (see previous posts for more information on those)

When the aircraft detects that it’s in a windshear scenario, it triggers a visual and audible warning to the pilots.

When a pilot receives a windshear warning, they immediately accomplish the Windshear Escape Manoeuvre.

This involves:

1. Disengaging the autopilot,

2. Pressing the TOGA buttons on the thrust levers,

3. Aggressively applying maximum thrust,

4. Disengaging the auto throttle,

5. While simultaneously rolling wings level and pitching up to an initial pitch attitude of 15 degrees,

6. Stowing the speed brake.

7. Follow flight director guidance.

This all happens quite quickly, and once the pilot is following the flight directors, which are providing real time pitch guidance to achieve maximum lift, the aircraft will climb safely away from the ground, and away from the threats that windshear presents.

Have a safe flight everyone.